Disconnect the choke cable and see if that makes a diff. if so it nite be the cable. if its an automatic choke take the cover of the air filter and look in at the butterfly it mite just need a bit of a wiggle

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You have fuel leakage on the pressurized/engine side of the fuel delivery line or filter at engine has a bad o-ring from being over tightened. Check all with engine running. And you should see a bit of fuel on the ground at the leak point.

could be a bad TPS or stuck, bad, dirty idle air control solenoid (IAC). check fuel pressure and check for vacuum leaks after the air flow sensor. more info is needed because what you describe could be many different things or a combo of different things

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I assume the car is a petrol! to stop a petrol engine the ignition needs to be shut down! if there is over run happening there are a few reasons for this. There is a problem with ignition mudule! spark plugs coked up! or the cylinders are coked.
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